## Electronics Quiz-5

As per analysis for previous years, it has been observed that students preparing for NEET find Physics out of all the sections to be complex to handle and the majority of them are not able to comprehend the reason behind it. This problem arises especially because these aspirants appearing for the examination are more inclined to have a keen interest in Biology due to their medical background.

Furthermore, sections such as Physics are dominantly based on theories, laws, numerical in comparison to a section of Biology which is more of fact-based, life sciences, and includes substantial explanations. By using the table given below, you easily and directly access to the topics and respective links of MCQs. Moreover, to make learning smooth and efficient, all the questions come with their supportive solutions to make utilization of time even more productive. Students will be covered for all their studies as the topics are available from basics to even the most advanced.

Q1. In N-type semiconductors, majority charge carriers are
•  Holes
•  Protons
•  Neutrons
•  Electrons
Solution
(d) In N-type semiconductors, electrons are majority charge carriers

Q2.A gate has the following truth table

•  NOR
•  OR
•  NAND
•  AND
Solution
(d) The Boolean expression for ‘AND’ gate is R+P.Q ⇒1.1=1,1.0=0,0.1=0,0.0=0

Q3.  In the circuit of a triode value, there is no change in the plate current, when the plate potential is increased from 200 V to 220 V and the grid potential is decreased from -0.5 V to-1.3 V. The amplification factor of the valve is
•  15
•  20
•  25
•  35
Solution
(c) Î¼=((∆Vp)/(∆Vg))∆Ip is constant =(220-200)/(-0.5-(-1.3))=20/0.8=25

Q4. The electrical circuit used to get smooth DC output from a rectifier circuit is called
•  Filter
•  Oscillator
•  Logic Gate
•  amplifier
Solution
(a) To get smooth DC output from a rectifier circuit filter is used.

Q5.Transfer characteristics [output voltage (V0) vs input voltage (Vi)] for a base biased transistor in CE configuration is as shown in the figure. For using transistor as a switch, it is used

•  In region III
•  In region I and II
•  In region II
•  In region I
Solution
(b) I → ON III → OFF In IInd state it is used as a amplifier it is active region

Q6. The unit of mutual conductance of a triode valve is
•  Siemen
•  Ohm
• Ohm meter
•  Joule coulomb-1
Solution
(A)

Q7.In a triode amplifier, the value of maximum gain is equal to
•  Half amplification Factor
•  Amplification Factor
•  Twice the Amplification Factor
•  Infinity
Solution
(b) The maximum voltage gain (Av)max=Î¼ (Which is obtained when RL=∞)

Q8.In the following common emitter circuit if Î²=100,VCE=7V,VBE= negligible, RC=2 kÎ© then IB=?

•  0.01 mA
•  0.04 mA
•  0.02 mA
•  0.03 mA
Solution
(b) V=VCE+ICRL ⇒15=7+IC×2×103⇒iC=4 mA ∵ Î²=iC/iB ⇒iB=4/100=0.04 mA

Q9.P-type semiconductor is formed when A. As impurity is mixed in Si B. Al impurity is mixed in Si C. B impurity is mixed in Ge D. P impurity is mixed in Ge
•  A and C
•  A and D
•  B and C
•  B and D
Solution
(c) The resistance of semiconductor decreases with the increase in temperature

Q10. A piece of semiconductor is connected in series in an electric circuit. On increasing the temperature, the current in the circuit will
•  decreased
•  Remain Unchanged
•  Increase
• stop Flowing
Solution
(c) Because with rise in temperature, resistance of semiconductor decreases, hence overall resistance of the circuit decreases which in turn increases the current in the circuit

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